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# J, 46 char

**Solution:**
```
(]#~[:([:*./(<./,>./)~:"0 1])([:+/"1@#:a.&i.))
```

**Test example:**
```
   (]#~[:([:*./(<./,>./)~:"0 1])([:+/"1@#:a.&i.)) 'oAPwSoeHcoDretMBBoesoBsagHDoew'
SecretMessage
```

**How it works:**
```
a.&i. converts from text to ascii number
#: converts from ascii number to binary
+/"1 adds the 1s in the binary numbers
(<./,>./) finds greatest and lowest values in lists
 *./(<./,>./)~:"0 1 produces boolean indicating locations of non-greatest and non-lowest values
#~ selects from original text locations indicated by boolean
```