diff --git a/solutions/elixir/series/3/lib/string_series.ex b/solutions/elixir/series/3/lib/string_series.ex
new file mode 100644
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+++ b/solutions/elixir/series/3/lib/string_series.ex
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+defmodule StringSeries do
+  @doc """
+  Given a string `s` and a positive integer `size`, return all substrings
+  of that size. If `size` is greater than the length of `s`, or less than 1,
+  return an empty list.
+  """
+  @spec slices(s :: String.t(), size :: integer) :: list(String.t())
+  def slices(_, size) when size < 1, do: []
+  def slices(s, size) do
+    length = String.length(s)
+    if size > length do
+      []
+    else
+      for position <- Range.new(0, length - size) do
+        String.slice(s, position, size)
+      end
+    end
+  end
+end